What it does
I'm not aware of any Magic: The Gathering keyword, ability, or even a card officially named "Sonic Blaster." It doesn't correspond to any printed mechanic like flying, deathtouch, or trample, nor to a known card in the game's history.
It's possible you're thinking of something from a different game, a misremembered name, or a custom/unofficial card. There are real cards with "Blast" in the name (like Pyroblast or Sonic Burst), but no "Sonic Blaster" keyword exists in the rules.
If you can tell me where you encountered this term—a specific card, set, or effect—I can help clarify what it actually does and how it interacts in Commander. Otherwise, I'd avoid treating it as a real ability at your table, since there's no rules text to support it.
Iconic cards with Sonic Blaster
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